You can always save your game before love potion event and load after that. There is more with him in the werewolf event, but to get more "steamy" scenes you need to let him change, after the event, when he got a cure and he is back in the village there is a new variation with him in hunting event.
Yep. Just saved before giving him the Love Potion. This was not the kind of scene I'd like with him soo loaded right back up. Also thanks :) I'm going to get busy with that
also in the 0.20 update you will get new event at his shop in the evening, conditions for it are werewolf event cleared and Bernard loves you twice (2 hearts), and yes it has steamy scene too you will love it haha