It's a typical reaction. Humans are designed to procreate with others, thus enabling a continuation of their genetic make-up.
He may be attracted to you as well, considering the fact he was awkward about it. Then again anyone would be awkward about a situation like that even if it was someone you knew or anything.
The only thing you can do is kind of play dumb I suppose- this'll either kill his ego or he'll overlook it and move on.
Or you could ask him- probably would freak him out, so this method isn't a popular thought.
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Maybe at the time he got the boner and started doing that he was only focused on pleasuring himself and was "in the zone." Then when he was done he realized how weird that was to do to someone, especially someone he does not really know.
if he was cute, id tell him how comfy his lap was. its a natural reaction, but he might have been turned on by you. id find out.
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Next time wiggle your butt against it. His eyes will probably explode.
If it bothers you too much just have him sit on your lap next time
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