I can’t just say ‘SIster you’re fucking me’

We’re in your room, with no door, it broke last week, your sister is in the hall on the computer, blissfully unaware. I have u tied to ur bed, blindfolded so you couldnt see anything, we are talkin loudly, deliberately discussing how we hoped no-one would hear us. i get down n start sucking your dick, ur making quite loud but not too exaggerated noises, after a few minutes your sister gets up, edging towards the door, wondering whats going on, she isnt stupid tho so she doesnt just walk straight in, she lingers at the door, just watchin, because if any1 seen somethin like that happening they cant just turn away straight away.
i look around and wink at her, wearing very very little, a hot wee corset n stockings, she looks kind of shocked n scared until i signal with my hand for her to come a little bit closer, ur still moaning quite loud cause all through this i dnt stop. You still have no idea whats going on. I tell her to come closer n silently communitcate to her that she can have a shot n it would be a secret, you’d never know, u are blindfolded, so you’d just think it was me. Obviously curious she comes closer, i move slightly, taking my mouth away but not removing my hand so it doesnt
seem anything suspicious is going on, she’s shy at first n doesnt know but gently placing my hand between her legs and just givng her a tight wee squeeze reveals that someone’s very wet. I tell her to shh, take her top off and move away and let her start sucking on your dick, ur completely unaware of the change and still think its me.
She starts to get into it and isnt so shy anymore. While she’s bending over the bed i gently shimmy her out of her pj bottoms so she’s only wearing a skimpy red little thong and start rubbing gently in between her legs, her breathing gets heavier and she’s breathing down on your dick, i start to play with her clit, not enough to give her an orgasm, just enough so she gets soo turned on she could never refuse wat was going to happen, once she’s
soaking i move away just standing and watching her.