Towel drops in front of an old classmate

It was a fine afternoon of summer. I was alone at my home. I really felt like a nice shower, so I get naked in my room and go towards bathroom with just my towel. I was really horny and already hard without even touching my penis. I had all the time with me to rub one off in shower.

While I was stroking my dick covered of soap, i was really fantasizing about some hot girl suddenly appearing in my house and I fuck her like anything.

I suddenly hear my doorbell. I was out of that fantasy and real world sucked. I was just stroking my dick alone in my house. I rinsed myself wrapped towel around my waist and go towards the door. From the peekhole i saw who has come. At first i thought it is my sister, because she had cloth wound on her head to protect from sun.(its pretty normal for ladies in my country). So, naturally thinking it was my sis, i open the door and was about proceed towards my room to get dressed.