If a guy is young enough to be able to come a few times, so there is plenty of cum to spare, or if I am with a guy long enough (e.g., day in and day out) that he has cum to spare, then I like to have him come on my body (not face). However, if those orgasms will be limited for whatever reason, I don't want to waste a drop of it; I'll take it all in my mouth every time.

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Communication is the key.