Teach Me Tonight (слэш)

“But… it would be a sin,” Steve says finally, sounding unsure. “Wouldn't it?”
“Not if I make an honest man outta you someday. Nobody's gotta know.”
“God would know,” Steve mutters demurely – the beautiful little shit. “Sister Elise says He knows everything.”
“God won’t mind if we get a little head start,” Bucky counters, “and what Sister Elise doesn't know won't hurt her.”