Fetty Wap: Alleged Baby Mama I'm Sure He's the Dad ... We Banged for 2 Straight Weeks!

The movie "When Fetty Wap met Masika" would be less romantic comedy and more porno -- at least according to the "Love & Hip Hop: Hollywood" star who's positive Fetty is her baby daddy.

TMZ has learned Masika Tucker filed legal docs demanding the rapper submit to a paternity test. We're told Masika explains in the papers, she and Fetty met last year and from June 28 until July 15 had "sexual relations on numerous occasions." She also states he was her only partner during that period. Ditto for the 4 months prior.

Bottom line for Masika -- who's 7-8 months along -- Fetty's her only candidate for the daddy.

Masika also wants Fetty to pay pregnancy expenses and child support once the baby arrives. She lists some monthly expenses ... including $4,500 for rent, $820 for a housekeeper and $2,000 for clothes.

We're told she says she's dropping $17k per month on expenses.

Masika wants the court to grant her full legal and physical custody as soon as she pops out baby Fetty.