Caitanya-caritāmṛta 17.290
rādhā dekhi’ kṛṣṇa tāṅre hāsya karite sei catur-bhuja mūrti cāhena rākhite
[raadhaa dekhi’ krishna taanre haasya karite sei chatur-bhuja moorti chaahena raakhite]
Blended reading (Sanskrit + English inline)
rādhā dekhi’ kṛṣṇa tāṅre hāsya karite sei catur-bhuja mūrti cāhena rākhite
When Lord Kṛṣṇa saw Rādhārāṇī, He wanted to maintain the four-armed form to joke with Her.
My note
Source: vedabase.io