Abel's in the middle of a satisfied moan when suddenly Cain's fingers pinch at his nipple and he yelps, surprised by the pain and the new sensation. "Cain!" he grouses, but it's hard to stay displeased while Cain is swallowing him down like that, and Abel arches with pleasure, knees faltering. "Ah--fuck--"

He doesn't know to warn before he comes, and it all happens so suddenly, much faster than when he touches himself. Abel's hand twitches in Cain's hair, and then he's coming.