Hello!
Yes, you have the possibility to avoid the NTR and to be able to corrupt Sakiko but this route will be developed during the chapter 1 to 1.8.
For the moment the cuckolding is the only route in development.
This is the content planned for future updates:
- Swinging (Aiko-Sakiko)
- More corruption content/netorase content (for both Aiko-Sakiko)
- More netori.
Regards.