In which Yamapi called it "Nabe Party". Really cute song, very very very very cute (it reminds me of K8 actually, maybe it's because of yoko and hina?) and so here's the lyrics for it.
There isn't any parts involving Pi for the singing, so only the talking part

HOME PARTY~

Hina: やぁ～今日はタッキー家でhome party楽しみなあ
Hina: Yaa~ I'm looking forward to today's takki home party

Yoko: そやな～あっ、ここと違うんか？
Yoko: Yeah~ aa, it's here no mistake right?

Hina: おっ、ここやここや  あれ？山Pまだかな
Hina: Oo, it's here, it's here, Eh? Yamapi isn't here yet

Yoko: あっ、来た来た　山Pが来たの巻
Yoko: Aa, he's here he's here, Yamapi has came

Yamapi: すいません遅れちゃって  じゃあ、お邪魔しますか
Yamapi: I'm sorry I'm late, So, let's intrude in

Yoko: お邪魔されますか～
Yoko: Let's go in~

Hina & Yoko & 山p: せ～の～　
Hina & Yoko & Yamapi: Ready, set~

Takki: いらっしゃ～い～
Takki: Welco~me~

Yoko: 歩いてきたから、もう疲れた、ちょっと横になってもいい～
Yoko: We have walked and came here, we're already very tired, is it alright for us to lie down for a while~

Hina: partyこれから、しかし腹減ったな～ タッキー飯まだなん？飯
Hina: Party has not started, but I'm very hungry a~ Takki, the meal isn't ready yet? Meal

Takki: 今日は 盛り上がって、行きましょう～
Takki: Let's get high today~

<singing>

Yoko: あ、気づいたらもうこの時間、明日大阪からの最初電帰らんと
Yoko: A, when we've realized it, it's this time already, have to ride the first train to Osaka tomorrow

Hina: え　でもまだ　パスタが残でんで、まぁちょっと冷めてるけど
Hina: E, but there's still some pasta left overs, well although it has turned cold

Yoko: 持ち帰るでちぃや～
Yoko: Bring it back home~

Yamapi: オレ今日泊まっちゃってもいいんすか？
Yamapi: Today, is it alright for me to stay over?

Hina: まあ、何ともいわれ、今日は
Hina: Well, no matter what, today was

Hina & Yoko & Yamapi: 楽しかった！
Hina & Yoko & Yamapi: very fun!