Your busty big sister is left to be your sitter, while your parents are out for the day. She's planned a pool day for you both but, you end up getting a hard on while you're both in the pool. She thinks it's cute & you bashfully admit to being a virgin. She tells you not to worry & says she can teach you. She pulls out your boner & expresses how lucky your future girlfriends are going to be before, shoving your raging boner down her throat. She fucks you in all the positions you've been fantasizing about, & she's even eager enough to let you fuck her in the ass. Finally, you cant hold your load back anymore & bust your nut in her ass, just to watch it drip out of her!