NVM i found it :3
during your date with Keith you get the option to get very angry at the woman, i forget which options I used. Basically I did all the pro-Tenebris options I could up untill that point. Then it gave me the option to get angry. If you dont use it you can go to Tenebris in the alley and then you get real turned on, if you choose to get angry then you get to see the Keith scenes.
(tho i do hope there is a way to romance them without going full yandere in the full game ^^)