Rias then passed the knight piece to Blaze who followed Herm's instructions, chaneling her energy into it causing the piece to go from being red with a black aura to white with a blue aura before passing it to Xenovia
"Why doesn't doing this tire me out as much as using my powers the other day did?" Blaze asked Herm
"Simple, that was you using my powers meaning that it is based on your abilities whereas we are doing this through a contract meaning that it is me using my powers meaning that you are just the body that I am using to interact with the world meaning that it causes you little to no strain" Herm answered
"Let's hope this works" Rias said as she watched Xenovia absorb the piece, a pair of pure white devil wings erupting from her back and the holy aura from Durandal synchronizing with her holy devil aura
"Wow, this is incredible, I not only feel stronger but also feel like I can better understand Durandal and use it better" she said as she swung Durandal fluidly as if it was a part of her body
"It is a holy sword so it makes sense that it would be easier to use as a holy being" Blaze commented
"She's not the only one to be enhanced" Herm smiled mischeviously
"What do you mean by that?" Blaze asked her before all of a sudden feeling incredibly aroused "WHAT DID YOU DO?" she shouted
"Now that you have another wife you need to be able to pleasure both of them" Herm said with a happy tone "meaning that you need to have the stamina and output to keep up with 2 people now in order to keep them happy, a small side-effect is that you will now need to cum more or harder during your training sessions with Rias, but that's not a problem as you now have someone else to help you with what you call your problem"
"A human futa, seems like I've found out what your secret is, it's to bad I have to stay pure in order to remain holy or I'd be thinking a woman like you could give me good kids in the future" Xenovia muttered
"That's not going to be a problem" Herm said "since you're technically a devil it means that the more devilish things you do the holier that you will actually become thanks to the contract, so get down and dirty with Blaze here and you will become even stronger and then you get the boost of me as a sacred gear that people who have a contract with Blaze get when making contact with her" she added
"Let me show you what Herm is talking about" Rias declared as she moved over to Blaze who was now sitting on the sofa breathing hard from how aroused she was getting and knelt between her legs "can't wait until tonight huh?" she teased as she pulled down Blaze's leggings, her cock standing up straight as it was released from its confines
"Please... just help me" Blaze muttured quietly, still not fully used to Rias being interested in her
"Ufufufu, oh it won't just be me helping you" she laughed "Xenovia would you like to come and help me? it will allow you to feel how nice it feels to be in contact with Blaze, I've found that the amount of power I gain from her increases when I touch her here and the feeling that comes with the power is very pleasant" she added as she started to stroke Blaze's penis
"I suppose I could give it a try" Xenova said kneeling next to Rias, reaching out and grabbing Blaze's penis as Rias moved aside "oh, this is a nice feeling" she exclaimed as she put her other hand on as well
"That's quite the grip you have there" Blaze moaned as the difference between Rias's soft and gentle hand and Xenovia's more rough and strong grip made for a pleasant experience
"Now you want to stroke it up and down until she cums" Rias explained "think of it being similar to milking a cow"
"If we're trying to milk her then the faster the better" Xenovia asserted as she stroked her hands up and down hard and fast
"you don't have to milk me that hard" Blaze moaned
"Don't act like you aren't enjoying this new form of pleasure" Herm teased
"Let us know when you're about to cum" Rias said from the side
"Now, I'm cumming now" exclaimed Blaze as she let loose a torrent of cum, splattering across both of the girls in front of her
"This is stickier than I expected" Xenovia noted as she wiped some of the cum off of her face
"You'll get used to it" Rias chuckled as she licked a a blob of cum off her hand "it also tastes pretty good as well"
"Hrm, not bad" Xenovia agreed as she tried a bit for herself
Seeing this Blaze instantly became hard again, Rias's eyes glinting at the situation "seems like once wasn't enough for you as usual" she giggled
"She'll require more than usual as having the 2 of you in a contract with her has made it so that she has the output to be able to please both of you should you ever want it" explained Herm
"Then let's keep going, I enjoyed the sensation that comes with touching you and the thought that I'll get stronger from doing so spurs me on even further" Xenovia claimed as she got ready to jerk off Blaze again
"Let me have some fun with her as well" Rias chuckled, undoiing her shirt and revealing her breasts contained in a lace bra "I can also show you other things that Blaze likes while we're at it"
"I'm going to reach blance breaker at this rate with how good the 2 of you feel" Blaze half joked before moaning in pleasure as the 2 devils worked together to get her to cum again and again.