R156/R166 yeah, I agree. Like I said, I acknowledge that they aren’t friends and it’s not likely they will be.

However, on further investigation, I will say that seems like it could be an idealised, wished-for personal relationship, more on Jonny's side. I’m not usually wrong about this kind of thing, at least intuitively (sorry in advance, tl;dr/flame me if you must: sometimes my old astrology hobby rears its head as one of several COVID coping mechanisms, and I had to get this out of my system, so bear with....)

If anyone goes in for astrology, Jonny's Venus/Mars in Gemini close to his descendent conjuncts Cillian's Sun. This shows Jonny's ambition, admiration, desire nature, and sense of beauty is illuminated, ignited, and literally star-struck by Cillian's presence alone; and, at the same time Jonny's projected fears and wishes are embodied by the other man, too. Most of Cillian's chart falls in Jonny's natal 4th & 5th houses, implying that a relationship between them would naturally engender a feeling of 'home', but also prioritise whatever both find very pleasurable. Cillian's blunt, headstrong, straightforward, and trusting Moon in Aries falls in Jonny's 3rd house, which suggests that there is an unusually high level of comfort and understanding in the emotional rapport the two have; Jonny is completely safe hearing Cillian's tough-love and sharing with Cillian certain feelings that he doesn't feel safe sharing with anyone else, even family or other friends who are closer to him or have been more present in his life (to the outside observer, it may seem as if Cillian can read Jonny's mind and 'horse-whisper' him). When the two are together, there is likely to be a natural emphasis on gentle but intellectual lines of discussion or debate, or if in a more private and relaxed setting a tendency to sink into touchy-feely private exchanges that look ‘psychic’. Both having fire-sign moons, they take to affectionate fierce cooperation and connection like ducks to water.

Being that the pair are close in age, Cillian's Neptune in Sagittarius falls near to Jonny's 12th house Moon/Neptune (sidebar: 12th Moon or Venus can indicate a romantic orientation unknown to oneself) - as the 12th is Neptune's home, this aspect weaves a mystical or 'fairytale' connection which finds expression in art (both love music and intended to be musicians as younger men, so that is a likely mutual ground) or in flights of fancy (with a wordly or curious bent, owing to Sagittarius). As a Moon-Neptune natal person himself, Jonny instantly recognises and vibes with this energy, because it makes him feel 'more like himself'. Jonny may try to sweet-talk Cillian with soothing romantic sentiments, as a way to reciprocate Cillian's heartfelt attention, as well as to get closer. Of course, Neptune is also the planet of narcotics, so there is a chance of Jonny 'addicting' himself to Love more generally, and more specifically to someone who can make him feel this kind of legendary metaphysical otherworldly love he craves....

For Cillian's part, it is harder to tell the effect Jonny has on him astrologically, as his birth-time is unknown. We can identify that he has Mars in Leo loosely conjuncting Jonny's Sun in the 7th and his Mercury in the 8th, meaning Cillian too can feel a pull toward partnership or connection with Jonny (physical or productive when Mars is involved, i.e. sex, conquest, business), albeit in a way more visceral than for Jonny. In social settings Jonny's charismatic being, confidence and showmanship attracts Cillian, and could compel him to react or respond where he might normally be silent. Cillian's natal Sun conjuncts Jonny's natal Jupiter in the 6th house, a warm upbeat and fortunate energy dynamic that may improve one another's health merely via time spent together. Cillian's Gemini Sun wants to connect with people on a cerebral level, but the fact he has an intuitive direct line to Jonny's heart & mind without saying a word may tempt Cillian to dig deeper in search of something in Jonny that isn't known to anyone else....