[He could. He has, so he knows he can, and despite the lack of outright skill, Dedue is... well, Dedue. Just the fact that it's him doing this is intoxicating enough.

And then he slows what he's doing, but doesn't stop, and it's almost better - like he knows how good it is, and wants to drag it out. He knows that isn't the case, but it's what his arousal-hazy mind feels like it is, at the moment, and it makes him moan quietly.

But that question... he's not entirely sure how to answer.]

I... [He takes a deep breath, lets it out in a shuddering sigh as he tries to ground himself enough to think. It's... difficult, but his friend deserves the effort.] I don't... not... want to.

[But that probably doesn't make a whole lot of sense, so after nearly slipping back into just focusing on the sensation with a soft, quiet moan, he keeps talking and hopes Dedue can make some sense of it - or at least make his own decisions from what he says.]

Whether I do or not... I fully intend to - want to - ride you. If I come from this, I'll be... oversensitive... when I do. It'll be intense, and a little bit overwhelming, but I... like that. [And that's a very big admission to make, especially to someone who he knows tends to focus on others' needs and desires first. But so be it.] If I don't, then... whenever you stop, I'll whine... and call you a tease, but... that's fine... And I'd be desperate to get you in me sooner.

[Hell of a set of options, but notably, as Sylvain lays them out, he's flushed, and hiding in Dedue's neck so he can't see how excited he is by either idea.]