[He is absolutely, utterly distracted and devastated by that groan. Wow. Have mercy on him.]
Oh--
[He gasps out a quiet moan when Keith flexes his thighs and... god. He leans up and kisses him before he can even think about it, an edge of desperation to it. It might not have been completely intentional teasing from Keith, but it might as well have been for Shiro's reaction.]