我18岁和19岁的继女看到我裸体勃起，可以吗？他们都盯着我的阴茎。

Actually, my step daughter surprised me! She had come to my house to spend the weekend and do some horseback riding. I was in the shower and not paying any attention. I stepped out of the shower, there was my step daughter sitting there with a smile on her face. She merely said “oh I am going to have fun this weekend". I'm sure you can figure the rest out!!