"Mmmph!" Was the only noise Steve could make as Tony came into his mouth, the come touching his tongue. It was a strange taste but not all that unpleasant. Closing his eyes he swallowed, even though his throat seemed reluctant to obey and just drank down all of Tony's come before lapping at the now sure to be sensitive head.
Finally he pulled back and licked his lips, cheeks red as the reality of what he just swallowed hit him. Though it was certainly something else to see Tony completely let go and Steve couldn't look away, already hard again almost just from that sight alone.