Also, I had another thought and that of him not actually being the father (if the CVs want to keep him in character). He kept saying to Lavania that he did not know how it happened as he was really drunk so perhaps this "fan" was already pregnant and this was all a plan? Perhaps Girish confided in his aunt and this is the plan the two of them came up with after the fan confronted him of her pregnancy?
I don't know but I hate to have such a nice guy's image ruined for a drunken mistake (although IMHO even drunk you should be able to have enough of an idea as to what is going on (especially being the male in the equation😆)...