A Manhattan lawyer who liked to dress as an airport security screener during S&M sessions with his girlfriend wound up choking and threatening her with a knife, prosecutors said Monday.

Christina Leos, a former preschool teacher, described for jurors how her pudgy, bespectacled former boyfriend, Ryan Hemphill, allegedly choked her during one of their rough-sex sessions.

“It hurt, it scared me, but there was no pain afterwards,” the petite bottle blonde, 32, said in Manhattan Supreme Court.

Hemphill, 33, the son of a pediatric neurologist, is on trial for allegedly assaulting Leos, with whom he enjoyed S&M sex games at his Murray Hill pad.

During pretrial hearings, prosecutors said the couple made a sex tape where he pretended to be a “TSA agent, searching her body cavities,” papers state.

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