AnathaShesha
I'd have to vote no on this one. It would devalue the MCs character, as he'd be breaking his promise to his wives again. Last time he had a good reason for a one time exception and the MC and the wife in question went way back in their background. The MC and Tita don't have a connection any where near that to warrant breaking that promise again and Tita has barely had a presence in the story for a long time now. She just doesn't feel anywhere near important enough to be devaluing the character of the MC for like this.I think it would be far more interesting if Tita over time were to fall in love with one of the MCs children. There is plenty of room to expand their harems.
I say yes to Tita and Erica Thea already has one of the triplets the son should get the other and abandon should get the oldest as for Erica it's only natural for a dragon and Phoenix to be together plus that's the only race that he doesn't have amongst his wives other than a demon which is weird as he rules the demons
Yes, He's been attracted to her since the beginning and hold back due to his promise to his wives. If he gets more Harem members it will be with their approval just like with his newest wife. Titans has been in love with him the most out of the triplets since their introduction I can easily see her being added as she's essentially already part of the family and the only girl that isn't happy yet.