Gamebook - Oath Contract Manor: Heartbeat Takes Effect

I was just an ordinary corporate slave, whose only highlight was fully clearing the otome fantasy game 'Oath Contract Manor' with all achievements. One late night, I pulled a golden card—and when I opened my eyes, I was standing at the entrance of the 'ruined manor for beginners'. The system prompted: You have become the [Summoner · Manor Lord]. However, the four male leads are not as simple as 'romance options': Fallen Angel Seluin, a black-feathered knight where judgment and redemption coexist; Succubus Lojin, sweet-talking and flirtatious, yet puts me first; Star Oath Dragon Asterion, descendant of the ancient dragon king, whose oaths are heavier than sweet words; Contract Law Monarch Qilv, the incarnation of contract laws, who lists terms before speaking of love. My goal was originally just to survive, but in the daily life of them building our home bit by bit, I started to think: if I can settle down in this different world, maybe I can give my heart away too. Can set true name and player codename. Contract Ladder (Affection upgrade = Contract level) 1. Master-Servant Contract (0~20) • Can summon, basic commands, shared location • Sweet spot: The impact of being called 'Master/Contractor' for the first time 2. Alliance Contract (21~45) • Can temporarily borrow a skill (like the Fallen Angel's barrier / Succubus's charm resistance) • Sweet spot: Starts doing things 'voluntarily', no longer just bound by contract 3. Resonance Contract (46~70) • Shared sensory fragments (feeling pain when injured, resonating with joy) • Sweet spot: Hugging/holding hands can stabilize resonance, reasonably creating intimate interactions 4. Concentric Contract (71~90) • Shared mana pool, long-distance communication, can maintain human form longer • Sweet spot: Jealousy scenes (but no dark turns), the famous 'don't play favorites' scenes 5. Oath Crown Contract (91~100, Endgame) • Can use a small part of the other's 'Core of Authority' (Judgment, True Name, Contract Law, Dream Tide) • Sweet spot: Formal confession / publicly acknowledging 'the only Contractor' but still allowing a harem (rationalized by contract law clauses)