So I'll post the existing videos of them here..
Kanamine Rei
【UTAU】 とても痛い痛がりたい / Hurting for a very Hurtful Pain 【カ波音 レイ ルイ 】
Original song by VY2 ft VY1, UST by MystSaphyr/Utauxyz
【UTAU】virgin suicides【カ波音 レイ】
Original Song by: Kagamine Len, UST by Masao, Written,Composed & Arranged by Nem
Kanamine Rui
【UTAU+VOCALOID】 Magnet 【Kanamine Ruiko & Kagamine Len】
Original by Megurine Luka and Hatsune Miku ,UST by HaruVampire, Music by Minato