Yeah so the end card wasn't lost in translation, penetration incoming!
Now the question is where will this lead? This opens up multiple routes actually...
1. Both him and Sakura doing it with someone else will somehow wash them of any guilt, making them reconcile a big possibility.
2. Shinobu didn't show any guilt or regret this ch, so staying with Fumi and rejecting Sakura if Nagi talks some sense into her is very likely.
3. Nagi trying again to land Shinobu after finding out Sakura left him is also an interesting option. Don't think she is just here to talk some sense into Sakura like a cheap plot device.
We still need Sakura's POV to paint the full picture...