What happened between Damien and Rose from that point forth was known by none but the two of them.
The room was isolated in space from the rest of the Real Plane and, while they did spend some time on physical intimacy, it wasn't their focus.
The only thing known about what happened in that room was that Damien and Rose almost felt like a single entity when they left, as if their souls had truly become one.
Nevertheless, Damien had spent a full two days, one for Rose and one for Ruyue, out of the three provided before the conference.
Since he was in the Sanctuary for most of that time, he was able to avoid the eyes looking for him like predators, but his disappearance only led to an increase in these people's interest.