[ Touma doesn't have but a handful of experiences with kissing (that he remembers), so each one is as vivid as the next, no matter how short or awkward. Sasha's is ... pretty much as he would have expected, if he had ever considered kissing her in the first place, which he totally didn't and you can't prove anything!!
But she's gentle, soft, and warm. It's a good reflection of her personality.
He both finds great relief and a small sort of sadness when it ends, but... it had to be done, right? They're not interested in each other like that and besides, the bot is satisfied with such a lingering kiss.
...it is satisfied, right? Touma sits still save for his breathing, eyes still closed, waiting for the explosion of confetti to signal their success. ]