Eggsy's pretty sure it is, in fact, at least somewhat about both of them, though he's not entirely sure he gets what Quentin is actually getting out of this. It's like sometimes with Dorian, where Eggsy just misses the point from the other perspective because he doesn't think the same.

It doesn't much matter in the end, though.

The leather on his dick feels much smoother than it probably would if this were live, but it feels good, warmed by his own skin and the friction of it. Quentin isn't keeping his hips from moving now, so they do, though he can't decide whether he wants to just fuck himself into Quentin's hand or push backwards and get more of that finger.

All of this is a lot, and his self-control during sex isn't all that great. He bites his lip, tries to make it less obvious how close he is just so Quentin won't stop. That, and he's trying to avoid asking Dorian's permission for as long as he can.