Well, considering it's her first time

Mercedes dove in, her tits keeping Sylvain's cock in place as she worked her way up and down the shaft.

Byleth watched over them, her face still stoic even as she began to work her fingers in and out of her slit. Even when she started moaning, her face never contorted in pleasure.

Mercedes' mouth felt amazing. Sylvain was obviously not a virgin, but feeling the 'big sister' of the Blue Lions work magic with her tongue...just heavenly.

It didn't take long for Sylvain to cum, his seed covering Mercedes' tits and face, as Byleth also orgasmed.

"I hope that helps, Sylvain," Mercedes giggled.

"Go clean up," Byleth instructed as she began to redress. "Sylvain, you're dismissed."

Sylvain grabbed his tome and left. He wanted to check on Shamir and Catherine, but he saw Dorothea and Petra talking, and couldn't pass this opportunity up.

Dorothea Arnault is a sex doll for Petra Macneary for her to learn about Fodlan lesbianism. At midnight, Dorothea Arnault will return back to normal, with no memory of what Petra Macneary did to her in doll form.

He also saw Archbishop Rhea walking to her chambers.

Archbishop Rhea will strip naked and masturbate in her chambers, fantasizing about being fucked Sylvain Gautier. When she orgasms, she will make her way naked across campus to find and fuck Sylvain Gautier. She will feel no shame in her actions, instead agreeing to allow Sylvain Gautier to fuck her any time and place he pleases. No one will find this odd.

Sylvain now had a choice. Watch Petra play with her new lesbian doll, or spy on Rhea and hear her fantasies about him? He would check on Catherine and Shamir on his way to do either, but he only had time to do one...