Best vaginal penetration 10/10 - face to face angled so there is some stimulation of vulva too, that is the most physically pleasurable way to get off.
Best anal is just not hurting, maybe 5, not bad not great, it's only good if the guy likes it, and isn't too big - I had a partner hung long but not thick, it felt pretty good with him but:
Both? One guy in ass and one in vagina? So good. It does add to the pleasure in that situation, certainly. Like 11/10. But the one in the ass kind of still not the more active.
ETA: I also really like when guys prefer vaginal, like you do. Even if they like both, even if they are bi, if they get off easiest in the pussy and prefer it that is the hottest feeling.
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