Well it is possible. I mean, look at the past chapters and episodes, Gray is starting to care for Juvia. Sometimes, he gets jealous over Lyon and sometimes he cares for her. Remember episode 120, Gray thinks of Juvia if she's safe or not. this is an example of him to start to care. In episode 134, many gruvia fans said that Gray is jealous at Lyon and Juvia. well it's true because you can tell it from his expression. This is an example of him getting jealous over Lyon. Another example of him getting jealous is in OVA 5. When Lyon carried Juvia, Gray got mad at Lyon for takign Juvia AWAY from HIM. Sometimes, you need to read in fairytail wiki about Gruvia. Remember when Erza told Gray to make things clear with Juvia? GRay blushed at this question. In fairytail wiki, it is said that "This is a scene that hints to Gray having feelings for Juvia or starting to develop them" Which means that Gray may have feelings for Juvia! So it is possible that Gray may fell in love with Juvia <3
It was always gonna happen, just a matter of when. Her feelings probably got through to him a long time ago but he didn't want to admit it until he was forced to
