at stud

at sale at sb's back at sb's beck and call at sb's bidding at sb's disposal at sb's disposition at sb's expense at sb's feet at sb's insistence at sb's insistent request at sb's service at sb's suggestion

in the turn of a hand in the twinkling of an eye in the upshot in the very act in the very act of in the very flush of youth in the vicinity of in the view of in the wake of in the wash