My Kimberly73 and I have also been experimenting with this. So far I have been able to get four fingers in her but only after a lot of oral sex and a few orgasms is she usually wet enough for it to be comfortable enough for both of us. If I can get her to "squirt" (usually after 10 or 15 minutes of clit sucking while fingering) it is much easier as she is feeling much more "looser". I have had yet to be able to get close enough to get all five in. So far four is the limit and after a while se sometimes complains about the four.

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