Comma Sense: Beneath Me Slithered . . .
Introductory phrases that directly precede a verb: Omit the introductory phrase’s comma when it is followed directly by a verb.
Grinding on my boyfriend’s lap was my best friend.
Now mark the unnecessary commas:
Out of the bedroom, stepped three beautiful, naked women.
Beneath me, slithered my girlfriend, her new boyfriend, and a man none of us had met.