This happened last summer. I woke up from a nap. I heard my step daughter talking to someone in the back yard so I looked out my bedroom window that over looked our backyard and pool.I saw it was my daughter and her best friend. I then was shocked to see them both sun bathing naked. I couldn't help but get hard to their tight little bodies and perfect tits. I took my cock out and started jacking off just staring at them. I came so hard at the thought of fucking their teenage pussies. I know I'm a creep. But I struggle to not get hard around my step daughter now. I have even jacked off into her used panties. I will never act on actually fucking her but the fantasy is great.