It's been a bit of time since completing these but hopefully this helps. I'm not certain about the exact wording for the hot spots but there are hot spots:
Quest 12
1. Tue evening (Laura is reading), hot spot "stupid joke", hot spot "tit!" and she'll sit on MC's face. Do this a couple times. She'll stop wearing panties.
2. Ignore hot spot "stupid joke" and MC will molest her (can't remember if there is a hot spot or not for this, don't believe there is). Choose "cum in hand" a couple times.
3. Once you get the option "don't cum" then you're almost done. Choose "don't cum" and continue to "cum in hand" or "cum on Laura". I recommend "cum in hand" first time, then "cum on Laura" later.
Quest 13
1. Mon sometime, go to store and buy "seduction beer". Tue night (meaning late Mon evening), choose "Lala's room" even though it doesn't do anything at first. Good habit for later. Then "Laura's room". Laura should be in black lingerie. Choose "touch". She takes the beer so you'll have to find a new spot to hide it.
2. Buy beer again, but at fridge scene choose "cooler" so Laura doesn't find it. Repeat "Lala's room", "Laura's room", and "touch". This is where my memory gets fuzzy (it was a long quest).
3. MC will ply her with beer. Look for hot spot "molest her!" on her chest (3 times). She'll have sex with MC.
4. Keep repeating. Eventually (if you've been clicking Lala's room), MC will see Lala spying. She eventually moves to between MC's legs, get a bj from Lala.
5. Continue to repeat. Laura catches Lala. You get the choice of "Laura's mouth" or "Lala's ass". Quest done.