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Tsubasa vol. 1 (left) ~ In the Hanshin Republic, Mokona says they should send the apple to Yuuko and "swallows" it.
XXXHolic vol. 2 (right) ~ Yuuko and the Black Mokona receive the apple.

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Tsubasa vol. 2 ~ Sitting on Syaoran's head, Mokona says he's also going to make a call and starts going "Hello? Hello? Hello?" (to the Black Mokona).

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xxxHolic vol. 2 ~ Mokona calls up the white Mokona to ask how things are, and to say the apple was really good.

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Tsubasa vol. 3 (left) ~ Mokona contacts Yuuko to ask for help in breaking the Ryanban's shield in the Town of Ryonfi. As payment, Fai sends her his staff.
xxxHolic vol. 3 (two right) ~ Yuuko gets the call and receives Fai's staff as payment. She sends them the spirit ball from the "Hundred Ghost Story Night" that Mokona sucked in. She only sent them half, though, because Mokona ate the other half.

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Tsubasa vol. 4 ~ In Sakura's bedroom, Mokona's "asleep" talking to the Black Mokona about his day. "That's right! Then Kurogane grabbed me and stetched me out..."

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xxxHolic vol. 4 ~ Yuuko has Mokona send five of the Fondant au Chocolat that Watanuki made as a present to Syaoran and Co. so she will be all set in receiving presents for White Day.
Tsubasa vol. 5 ~ Mokona receives the Fondant au Chocolat and instructs them how to heat it up. Kurogane doesn't want any, but Fai "pok"'s it into his mouth. Mokona's very happy and announces he'll tell Yuuko.

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xxxHolic vol. 4 ~ Mokona calls Yuuko from Sakura's bedroom in Oto to update Yuuko on what's happening, while Sakura and Syaoran are running the cafe downstairs. He thanks Yuuko for the chocolate and she reminds him about White Day. He shows her the sign Fai drew for the cafe, and Yuuko exclaims that have to name the cafe "Cat's Eye."
Tsubasa vol. 6 ~ Mokona tells Sakura that her heard a noise so shocking he had to come down and check it out. (Cutting his conversation with Yuuko short). He also tells them what Yuko told them to name the cafe.

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xxxHolic vol. 5 ~ Yuuko sends something unknown to Syaoran and Co. the remind them of their White Day duties.
Tsubasa vol. 7 ~ The item Yuuko sends reveals itself to be an arrow, which shoots out of Mokona's mouth. A note attached reads: "I want my White Day payback! If you don;'t give me my due, you'll be punished three times over! -Yuuko"

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Tsubasa vol. 9 ~ While enjoying himself eating, Mokona asks Ashura-ou if he can have a bottle sitting nearby. She agrees and he sends the whole thing to Yuuko. Later, in a talk between Yuuko and Ashura, it is revealed that it is the Liquour of Eternal Youth and is the price Ashura paid to Yuuko, so the Space-Time Witch would send the children to her world, effectively cutting off Fei-Wong Reed's sceaming.

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Tsubasa vol. 14 ~ When they return to Shara after changing the future, Mokona opens his mouth in front of the Ashura and Yasha statues and pulls out both the ruler's swords and swallows them, sending them to Yuuko.

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Tsubasa vol. 14 ~ On Sakura’s request, Mokona contacts Yuuko so Sakura can give her her thank you gift, a dress she made with Tomoyo’s help. Yuuko also calls it an even trade for their original clothes she picked up. But, Kurogane, Fai, and Syaoran still have to give her their White Day presents.

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