Relentless teasing leads to exhibition and no-shame, explosive loud sex, while her cousin is in the adjacent room. [MF] [LONG]

Set up: My girl, her younger cousin, and I are going on a road trip. Her cousin is staying at our place in the guest room. We wake up early that morning to get things ready. She slips off the bed. Against the morning light her brown skinned body glows. In a thong she goes to closet to get ready. My blood warms, I start to get hard, as we haven’t had sex in a while. She catches me staring. Arching her back she kneels down, takes off her thong, as she reveals the underside her freshly waxed pussy, glistening in that gap between her legs. My cock reacts upward. Giving me a devilish smile she walks over.
While putting her hand over my cock she whispers in my ear, “we can’t…”
I kiss her neck, I didn’t care her cousin may hear us.
“She’s 16, she understands,” I said to myself.
My girl stops things from getting out of control. She walks away to the shower. I can tell she’s horny too, between our busy schedule we haven’t had time to “release.” I can hear her cousin (Grace) is already up and about. Reluctantly I decided against my urge to follow my girl to the shower. I wanted a proper unhinged fuck. I ready up, pack the remaining things in living room, and return to our room to find her in front of mirror reflecting a skimpy, short black summer dress, tight around her body. My eyes scan her fit legs. Instinctively, her legs guide my eyes upward, toward that “mysterious” gap that stops me from seeing the whole picture of what’s underneath. I get a tease of her hard round ass, hugged loosely by her dress. My eyes follow her aggressive inward curves on her lower back, which blossoms outward as I land on her upper back, shoulders exposed. She stares at me as I’m fixated on her. It turns her on.
“You’re killing me…”
“I know…” she grins My cock is tenting out of my pants. I urge forward, with my hand aiming to re-discover what’s underneath. Our lips climb over each other, my hands grasp over her butt cheeks, and I grab them with hornified righteousness. I want to feel her, so I place a hand on her thigh and lift her dress. Continuing, I slowly slid my hand underneath the front side of her thong. The tip of my fingers reaches her silky slit. I lightly tighten, releasing some of her natural body lotion on my finger. Softly, she whispers. Fuck it, I thought, I’m going to for it. And just as her thong is majestically falling between her columns…
“Natasha!!” her cousin Grace yells from the living room. I look up towards the ceiling, enraged, “Jesus fucking christ, really??” I whispered.
My girl sighs, and collapses her head on my shoulder, “I’m coming!” she replies.
“Not any time soon,” I snap back.
She looks back at me, also disappointed. Resigned to our change in fortune, she raise her thong back to its unintended place, shielding my pussy away for the rest of the day. Sorry, she says and walks out .
“That lil cunt,” I thought, sitting on the bed, me and my mad hard cock glaring at each other.