Well, I have no idea if this ship will be like the Enterprise, unable to land on a planet, or like the Voyager, which could... and could therefore "launch" from a planet's surface as well as "land". As for "adult"... we have a tag above that says "sexual themes". When it comes to romance, Sev isn't fussy about species. He's used in stories where I need a character who "sows wild oats". Bey travels the universe for different reasons. Though they do relate to building a family foundation. Sev is just in it to scratch a hormonal itch. Plus build some business ties. Chuka is just a lost teenager. Would like nothing better than finding his way home.
Another plus for Sev and Chuka. Sev has a literal Third Eye that can see the supernatural (spirits of the dead). Chuka is a literal dynamo... a critter about housecat-sized, able to generate/manipulate electricity (kinda like a Pikachu... but with quills). Bey is rather normal, compared to these two. No special abilities, just the normal physical skills of his kind. Each with their own unique cultural/social backgrounds.