maceration
Getting so turned on by something that happens around you that you cum without even trying, like a kid who gets excited at a birthday party.
I was at a concert and saw Megan sing. I came without even trying. That’s maceration.
My friend got so excited watching Liz’s makeup tutorial that he came. That’s maceration.
I was in class and heard a rumor about Megan. I came. Classic maceration.