Let her give you head while slipping her finger in your ass. Flex those muscles, she will feel and locate your prostate. Have her roll her finger on it while blowing you and signal her just as you are about to cum. Have her apply a firm pressure to it and its just like when you flex it, only youre relaxed and able to cum harder. The pressure she applys will make you cum really hard and for longer.
Anal beads are a really great thing to let her use on you during a blowjob too. As she blows you, she pops out a bead which triggers all those muscles to tense briefly. If you guys practice she can learn to time the beads with your signals and trigger your muscles as you orgasm.
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