Gag her tightly, then give her a "present"

You smile and kiss Helen deeply. Your tongues dance for a while but then you pull away and before he closes her mouth, shove her ballgag back in. You then buckle it on just like before. Then you realise something, its not as tight as it could be.

You simply have to amend that. So you move around behind Helen and tighten the strap a few more holes. When you look at her face you see that the straps are digging into her chin and are now decidedly uncomfortable.

Seeing as she´s now gagged securely you push her down on the floor. "On all fours bitch!" You´re a bit taken back by your angry, dominating tone. Helen looks back, submissive but a bit scared and obeys quickly. You slowly take off your shirt and then your pants. As she hears you unbuckle your belt, Helen turns and her eyes widen before looking away at the sight of your hard cock.

After undressing, you take one off your socks and pull it over her eyes as an improvised blindfold. Then you get down behind her and feel her bare pussy. Its well trimmed with a patch of hair above it, and its soaked. Helen moans and bucks her hips at you as you fondle her pussy, then groan in frustration when you pull away.

You stroke your cock slick with your pre-cum and her pussy juices, then you get up right behind her and line up your cock with her pussy. Before penetrating her you lean forward and whisper in her ear. "First time getting fucked?"

Helen shakes her head. "Naughty girl." Then you push your cock into her tight pussy hard and fast. Helen tenses up while you push it in and then exhales. Again, you lean forward and whisper in her ear. "Here´s your present, my naughty little bitch!" And then start ramming her pussy like a jackhammer. Helen yelps and squirms under you as you pound her pussy like a madman. Maybe you are a little mad though, considering you´ve just spanked and are now fucking one of your students.

After just a moment of this, Helen cums and slumps down a bit but you´re not nearly there yet. You also feel her pussy spasm around your cock and make it your goal to make her do that again. So you try to maintain your fast and hard pace while you reach around and start to rub her clit with one hand while you pull her back up with your other hand pulling at her hair.

Helen moans in ecstasy as you do this and you feel her hips move to meet your cock as you ram it back in again and again. Then, after some time, you feel the familiar surge in your groin. "Here it comes, Happy fucking Birthday Bitch!" Helen cums as she feel the first spurt of cum from your cock, almost overwhelmed with the sensations of her second orgasm and having her beloved Master fill her with his cum. After this intense fucking you sit back on the couch and cuddle with Helen who then moves to remove her gag...