Yandere na Kanojo ni Shinu hodo Tsukusareru ~Jusei sasete? Anata no Seishi Hitorijime ni shite Dare ni mo Watasanai~

Maria is your childhood friend, a well-behaved proper young lady.
She dreams of marrying you, waking up to you, cooking your meals with love.
But in reality she's an insane princess with insane emotions!

When another girl confesses her love to you, Maria loses her head!
Nobody can have you! She has a lockdown on your cum, in her womb only.
Spew your hot seed into her guts and make a baby.
She wants your babbyyyyyy!

[From English Dlsite]