On pg. 10 of the FFXIII-2 Ultimania Omega guidebook, Noel and and Serah are only described as “partners” (パートナー
while Serah and Snow are still described as “koibitos” (恋人
— meanwhile, Yeul is identified as Noel’s “taisetsu na sonzai” (大切な存在
, or “important person.”
Added to that, Yeul is referred to as Noel’s koibito on pg. 18 of the same book:
(translation by hitoshura)
—
“Your time-gazing friend”
Noel, a descendant of the Farseer tribe, has heard about Valhalla and the gates from Yeul, the Farseer maiden from his time and his lover. Because Lightning also knows this, she is hinting at Yeul with the expression “your time-gazing friend.”
—
Japanese text:
—
「時を視る彼女」
時詠みの一族の末裔であるノエルは、ヴァルハラやゲートについて、同時代の時詠みの巫女であり恋人だったユールがら聞いていた。ライトニングもそれを知っているため、「時 を視る彼女」という表現でユールのことを示唆している。