Sure, but you'd know that that was supererogatory because you'd achieved the purpose with the first mammary mashing.
Any further tittyfucks would just be like gaining XP after you'd already hit the level cap...
Now, it might be that the tittyfucking was enjoyable, but we don't have enough data on that (there's nothing more frustrating than trying to titfuck a girlie whose boobs aren't built for it, and we know nothing about this Destined Lady's teats).