Finally i made to the quest where u have to talk to everybody for a present to sera - well - it doesn't work - i spent 3 1/2 hours and always it stucks at the last person to talk to - traveling and return brings the quest to a point that i talked with everybody, but no interaction with sera. i remember, that there was a interaction "go to my room" (or something else) but it was like years ago - no options available - only kissing, talking to her and so on. did i messed up with that option with the room going earlier? cause there was nothing happening - i thought it would be the night of my life, but nothing happend. so i just ignored. to go back to a savegame with that option, well - i'd rather skipp it, must be like 20-40 gaminghours ago - no thanks.
i talked to sera after completing adamant and had to cut through many dialogs, and even after - no options - no jumping into bed or else such kissing.
anybody has an advice?
appreciated folks 
Edit: Problem solved - i restarted the game and everything was alright.