By increasing your stamina, each time you finish a day (having ejaculated at least once), your stamina increases by a certain amount. When you have enough stamina to avoid automatically ending the first sequence in bed, you can choose between going to sleep (the second sequence, where she gives you oral sex) or going to the bathroom. If you choose the latter, you must wait to recover your stamina. If she’s in a good mood/horny, the bathroom section will automatically begin. If she gets annoyed, it’s best to wait until she lets you proceed

As for cowgirl, the same applies: have plenty of stamina. From then on, you must have sex (penetrate) with her and have a positive heart balance (meaning her affection hasn’t decreased from penetration, or if it did, that she has more affinity towards you at the end of that section). After that, you must stimulate her for several days in a row without angering her and without penetrating her again. Eventually, she will automatically assume the cowgirl position at the beginning of the second section or after the blowjob