User blog comment:B214/Shin DxD 1 discussion/@comment-3965848-20180903064427/@comment-34061653-20180903111953

A few key differences though.

1. This isn't the finals.

2. Issei is considered the favorite to win where as Stella was considered the favorite over Ikki.

3. Ikki was considered the wall for Stella to overcome where as here Rias is the wall that Issei has to overcome.

To answer your question, it's highly unlikely we will get a sex scene.