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After catching you watching inflation fetish porn, your girlfriend is intrigued. After asking you a few questions about the safety and reversibility of inflation, she decides she wants to try it out herself. You hand her the air hose, and she starts to inflate, her belly steadily expanding until she looks like she's pregnant with triplets and ready to pop! To your girlfriend's surprise, she enjoys the feeling of her belly expanding and finds it very erotic. After lifting up her dress to expose her massive, inflated belly, she gets so horny that she wants to get fucked right there on the floor. As you're having sex, she decides that she wants to get even bigger, and asks you to keep inflating her. You are happy to comply, pumping air into your girlfriend's belly while you fuck, looking down on her while she starts to disappear underneath the growing, round mass. The bigger you make her, the hornier she gets, until she finally has an intense orgasm on your cock!