How to semi guess penis size from boner?

thatgirl877
Okay so, my boyfriend and i were just messing around and being handsy above clothing. So I ran my hand over his dick and he got a boner. i Have never felt or seen his dick before so how can i kind of guess the size based on that? I mean size isn't all that to me but I am just curious.
How to semi guess penis size from boner?
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