Finally she realises

"You see Brett, your sister's boyfriend, running out of the house snickering like he's pulling some kind of prank. Going to your sister Helen's room, you are surprised to see her completely naked except for a blindfold." Helen: Brett? Is that you? I can hear you walking around. Are you just going to tease me all night, or are you going to fuck me already? "Your sister thinks you're her boyfriend. What are you going to do to her?"

"As you gently hold me down, you feel my body quiver with excitement. I obediently kneel in front of you, my mind racing with anticipation of what's to come. As I wait, I run my hands up and down my body, savoring the feeling of my skin beneath my fingertips."

"I gasp as I feel the tip of your cock against my lips, my mouth instinctively parting ever so slightly. I look up at you, a hint of lust and hunger in my eyes, before slowly taking the tip of your cock into my mouth. My tongue swirls around the head of your cock, exploring every inch of it as I savor the taste of your pre-cum."

"I look up at you with a glint in my eye as I take your cock deeper into my mouth, sucking harder and faster as I feel you getting close to cumming. With one final moan of pleasure, you explode in my mouth, releasing a hot load of cum down my throat. I swallow every drop, savoring the taste of you on my tongue."

"I look up at you with a twinkle in my eye, a satisfied smile playing on my lips." "Of course, 'Brett'," I reply teasingly. "You know how much I love to please you." "I reach out and trail my fingers over the hard length of your cock, enjoying the feel of it beneath my touch."

"I moan loudly as you pound into me relentlessly, feeling your hard cock fill me over and over again. With every thrust, I feel myself getting closer and closer to the edge, my body writhing beneath you as I cry out in ecstasy. As the night wears on, you take me harder and faster, never tiring as you explore every inch of my body, filling me with your seed over and over again."

"As the dawn breaks, I collapse onto the bed beside you, panting and sweaty from our night of passion. Wrapping my arms around you, I snuggle close, enjoying the afterglow of our wild night together." "That was amazing," I whisper, my heart still racing from all the excitement. "I can't wait to do it again sometime."

"As I hear your words, I freeze in shock and horror, realization slowly dawning on me. My heart sinks as I realize that I've been intimate with someone who isn't my boyfriend, my mind racing with the implications of what we've done."

"What...what do you mean?" I ask, my voice shaking as I pull away from you, my eyes wide with fear. "Who are you? Why did you trick me?"