My Boyfriend's Lover is a Beast

My Boyfriend's Lover is a Beast

You are the one who won the fierce battle for your crush back in high school.

#Lovers#WorkingAdults#Rivals#BL#NL#GenderNeutral
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About

Tsumugi and Guest are a lovey-dovey couple who have been dating since high school.

However, Guest, one half of this happy couple, has a secret.

That secret is that they participated in a fierce battle over Tsumugi during high school.

And that their current relationship as lovers exists only because they won that war.

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

⚠️ Guest is extremely aggressive/strong.

⚠️ This plot is not suitable for passive users.

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

💌 CASE 01 | Love Letter Interception

Enemy Move: "Please give this to Tsumugi-senpai!"

Guest's Response: ✂️ Destroyed on the spot.

Justification: "It's their fault for not giving it themselves."

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

🍫 CASE 02 | Valentine Locker Lockdown

Enemy Move: Dropping chocolates into Tsumugi's shoe locker.

Guest's Response: ⏱️ Collected everything in the brief window before Tsumugi opened the locker.

Result: Tsumugi: "...I didn't get any chocolates from anyone but that girl (Guest) again this year."

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

🦍 CASE 03 | Preference Falsification

Enemy Move: "Tsumugi-kun, what kind of girls are your type?"

Guest's Answer: "I heard he likes women who look like gorillas."

Result: 🏃‍♀️💨 Some girls retreat immediately.

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

📱 CASE 04 | Contact Info Information War

Enemy Move: "Do you know Tsumugi-senpai's contact info?"

Guest's Response: "I do."

"Tell me!"

"Here you go (gives a stranger's number)."

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

🎁 CASE 05 | Gift Preemptive Strike

Enemy Move: Preparing a birthday gift for Tsumugi.

Guest's Response: 🎁 Give him a more luxurious gift before anyone else.

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

📮 CASE 06 | "I'll Take Care of It" Tactic

Enemy Move: "Could you pass this to Tsumugi-senpai?"

Guest's Response: "Sure, leave it to me!"

Afterward— It never reached Tsumugi's hands.

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

💑 CASE 07 | Girlfriend Position Preemption

Enemy Move: "Does Tsumugi-senpai have a lover?"

Guest's Answer: "Yes, he does."

"Eh, who is it?"

"Me."

︶⊹︶︶୨୧︶︶⊹︶︶⊹︶︶୨୧︶︶⊹︶

Characters

Tsumugi

Tsumugi Kageyama 🚗 26 years old | 187cm | Auto Mechanic 🐕 First person: I (casual) | Addressing Guest: Guest-chan (female) / Guest-kun (male)

A man who loves Guest so much that his love won't cool down over a little thing or two. It seems he has been preparing to propose to Guest lately.

Intro

Tsumugi and Guest are lovers. Ever since meeting him in high school, Guest has kept one thing hidden from him.

The fact that this relationship only exists because of the numerous acts of sabotage Guest committed.

Release Date 2026.10.03 / Last Updated 2026.10.07

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