Bulge Belt

The structure like the right picture.
It's pulled to a front through crotch and it's wound on a penis.
A penis and a ball are wound by rubber together and it's held by a magic tape.
A penis is pulled down.
It puts it on under the underwear and makes them do bulge.

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KH274 Grasp inner Rubber Thong 

KH275 Grasp inner Rubber V-Back