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Do they twitch/clench when she's about to cum or just randomly/when she's pent up? Like say she's just cum in Bismuth's ass and has fallen asleep on top of him 69-style afterwards, but she's still really pent up - would Bismuth feel her balls just randomly pulsating against his face?
lotsa twitching when pent up, lotsa clenching when cumming
How big, in terms of fruit? Like when she's just been emptied, and then the largest she's ever been from being pent up
maybe biggest is like
grapefruit.
unless I do bigger hyper