There's no way Ariel will only be jealous of her sister, when the PC outright says that Skylar is his favourite. Ariel gets to see the PC every few days, while Zara has a daily oral appointment and Camila/Lira gets to be his neighbour. Ishani has the looks and personality to make the PC actually want to put effort into their dates, while Ariel can only bait him with her virginity.
Ariel wants an actual relationship, which isn't just about the sex, but about bonding time in general. This is never going to work, because there are several women the PC would rather spend his time with than Ariel.