You know, I like Rio. But the reason is not sexual. The little one is being pushed around so much that it awakens that protective instinct.
Quinn, supposedly Rio's best and longest friend, uses her as a scapegoat for her problems with Tommy. As soon as Quinn gets the upper hand again through Lily, the just drops Riona. She is a sweet, hot and fun girl. But I think she's too good-natured, which is why a lot of people take advantage of her. Riona doesn't deserve that. I'm glad to see so Camila has become a good friend for Rio and my MC will be the same for Rio.
Small guess. Rio has known the MC for much longer and he can't remember Rio though. How? The MC helped his father when he was 15 years old. Where or with whom? Luis. Luis was already married when Neil first saw Lynette. He probably also has children older than the MC. I think so Rio already met the MC a few years ago.