“Well darling, you seemed to have been a good boy…As such, I’ll be heading to the bedroom…If you’d be so kind as to join me there before the hour is out, well see about that little…‘Restriction’, about your shaft. don’t keep me waiting.” Came the soft, sensual voice of rarity, as she left the stallion, heading towards the curtain slowly.  
Joining her was a bit of a problem, as he groaned out weekly, falling forward onto a pillow. He’d been bound up in a strict hogtie, a black, leather muzzle hiding a large, phallic gag, with his shaft on show. On show, within a cage barely big enough to fit it when it was soft. He’d visited his Mistress a few weeks before, and left with the cage on after she’d spent an hour letting his shaft feel how skilful her magic and her mouth could be, keeping him right at the brink.  
He’d came back after the store had closed every day for that past week, letting her bind him like that, unlock and tease him, before sending him home just as frustrated as before. Each time her outfit had gotten more and more revealing, now down the tight fitting bra, the stockings, the gloves and even the thong. He’d half expected another tormenting session of being unlocked, teased in yet another diabolical way, and then left blue balled…  
In a way, she was doing just that, with him having to try and scale a flight of stairs in an hour, hogtied.  
…I might have enjoyed this picture a bit too much.