This guy got a b*ner when I sat on his lap, what should I do?

im a freshman in high school this year, and my friend is friends with a lot of guys, we went to the mall and she invited some of the guys she's friends with, later that night e went back to her house to watch a movie. there wasn't enough room on the couch so one of the guy that i´v never met before said I could sit on his lap.(he was really cute) and so I did. like halfway threw the movie, he got a really big b oner. and he kinda started to move around. when the movie was over it as really weird around him because he wouldn´t, make eyes contact with me if we talked. did he feel as awkward about it as I did? and should I have gotten up? (im really short and skinny so I don't think I crushed it)
This guy got a b*ner when I sat on his lap, what should I do?
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