Blush.
"Um... you can... I mean, being useful to you in that... as a thing-that-is-for-sex, that's..."
"Even if the details are unfun in the moment you would find it fulfilling?" Eelesia suggests.
"Um, yeah. Not that... um, it might be pleasant all around, I don't know, I just... it sounds like exactly the kind of thing I, um, want to be for?"
"You want to be a good friend to us, too?" Eelesia tries.
Shy nod. "Not just that. It's... hot. As a thought. Using our friendship like... emotional bondage, to hold me down while you... because, I do, you are. My friends. So."