Shirou
Shirou laughed as Jeanne's hand crept up and touched his aroused member. "I knew when you did that it wasn't an accident!" He looked over to Sakura, and saw she was pleasuring herself to their display.
And that the way she was doing it looked odd, like she was rubbing a strap-on for some reason.
He slowly reached out, without her noticing, and grabbed the blanket, pulling it off her to see…
The biggest penis he'd ever seen in his life.
He had several questions, but Sakura began to blather first, her penis twitching rapidly as he looked at it.
"Senpai, it's not what it looks like! Ok, it is but there's a reason for that, I swear! Jeanne was low on prana and this was the best way to give her it, you see—"
"Sakura, it's ok, I understand." He cut her off with a smile. "You just wanted to try out being the man in the relationship, right?"
She nodded slowly, as if she had been caught doing something guiltily.