They scream their names in epic clashes in battles (and the Indra transmigrants have done the same, Madara has screamed Hashirama's name too and Sasuke has with Naruto's name). That isn't sexual. It is more like a battle cry.
Asura's transmigrants don't really all chase after Indra's. That was just more so of a Naruto/Sakura thing. When Madara left Konoha, Hashirama didn't chase him or try to bring him back. In fact, it was Madara who came back and challenged Hashirama to battle. Also, do you remember how excited edo Madara got when he sensed Hashirama's chakara and when edo Hashirama landed on the battle field? There are memes about it! (Even then it still wasn't sexual though. Madara just wanted to fight him.)
Anyway, you're right about Mitsuki and Boruto, but even that isn't sexual/erotic. Extreme attachment? Yes. Sexual? No. Do remember though that Mitsuki is a synthetic human who grew up under Orochimaru of all people. He isn't exactly normal, yet even he ships BoruSara if that says anything about the whole sexual/erotic comment.