If you've read your erotic romance (aka smut) books, you'll know of the two main ways for the classic MFM threesome sex encounter to go. These
spitroast games
highlight one of them: a cock in her pussy (or her ass, that also works!) and a cock in her mouth, keeping her pinned in pleasure like a roast on a skewer. She can moan and squeal, but if her lovers are any good as they work her back and forth between them on their cocks, she won't need her mouth for talking. Non-stop orgasms as they pump her full of cum.