All my donations have been through intercourse. I had one who wanted me to do it in a cup but I only agreed because I felt she would change her mind eventually when she was more comfortable with me, and she did after the first attempt.
Indeed, the amount of willpower it takes to hold back. Especially when she was riding him and those lovely big tits are just bouncing in his face. A good tactic I do is when I feel the build up of when I’m about to cum I stop completely and look away until I’m back to what I call stage 1 again lol. From there I repeat to the point I only cum a little but not fully. After that is pounding time when I can last long with these type of girls