My stepsister on her cell phone and her boyfriend taking it all the way in

I was standing there next to my stepsister, she couldn't take her eyes off her phone. Her boyfriend looked at me, so I walked over to him, and he told me she was always glued to her phone and never gave him what he wanted. So I started giving him a blowjob while she was busy. He started fucking me hard and deep while she kept scrolling as if nothing were happening. With every thrust, I had to cover my mouth to keep from moaning too loudly. He left it all inside me, right to the hilt, and came inside me without her even noticing.