I thought only AltoxRanka shippers were upset about the sexual thing
IMO, they didn't but sexual tension was clearly present and strong : when Sheryl's tears dropped on the futon, the camera was on subjective mode. First Alto looked at the tears then Sheryl's thighs. Even if he was shattered by Sheryl's pain, he was, at the same time, aware of her body so close and so warm. Good job Kawamori, you've reminded to the audience that noble feelings can be mixed with physical desire ^^