The first one is Lena masturbating to some BBC porn. It features a cameo appearance from one of the characters from GGGB. Iris is her name I think. That whole scene is pretty complicated to unlock and I think you need few things. One, Lena has to spy on her roommate having sex with Jeremy and later masturbate to their pictures. Two, don't think about Axel. You can't have Lena reminisce about her time with him. Three, don't do drugs while Lena, Ivy, Jeremy and Lena's roommate are going out and you can't get drunk during the after party where you play truth or dare. I'm not sure if this means you have to skip on the whole game but just do it to be safe.