Analyzing each natal chart individually:
* Neptune in aspect, specially soft ones, to sun, moon, Venus, mars and ruler of 8th house.
Mars is the way we achieve what we want and Venus is how we enjoy it, so I think Venus is even more important in this case, specially for a man.
* Venus in easy aspect to Jupiter, specially in a water house.
Giving yourself needs generosity...
* Neptune in 1st house (self), 7th house (mirror of the self), 5th house (the way we apply our creative energy) and 8th house (intimacy, merging);
* Venus or neptune in conjunction, opposition, trine or sextil to mercury.
This denotes a poetical understanding of the world and the partner's universe.
* Vesta conjunct chiron in water houses.
A powerful combination for healing and dedication in an almost devotional sense.
* Mars or venus in cancer (tenderness, nurturing), Pisces (empathy), virgo (dedication, taking care of).
* Ceres in 8th or conjunct/opposite its ruler.
* Synastrically, Ceres, Neptune, Moon and/or Vesta aspecting love planets and/or their dispositors, cusps or rulers or their dispositors of 5th or 8th houses.
* You've mentioned a healing nature in this tender lovemaking then Chiron aspects can be found in the synastry.
* A real deep merging needs the capability to experience a strong psychic bond and interaspects and placements involving Mercury, Moon, Pallas and Neptune, maybe Uranus too, could be an expression of this. I know how powerful Pallas can be in relation to telepathy and deserves attention.
I know your question was about aspects between charts but I do believe in the importance of chart comparison. Sometimes there are some aspects indicating that you are going to experience something but it doesn't happen because of a incompatibility between the sinastric aspect and individual configurations and placements, of just one or both.
Regards
P.S.: I loved the topic.