Parikshit was the increaser of their line
'Pāṇḍūnāṁ mānava-vardhanaḥ' (SB 1.4.10).
Group
Pandavas
पाण्डव
The Pandavas are the five sons of Pandu (Yudhishthira, Bhima, Arjuna, Nakula, Sahadeva): heroes of the Mahabharata, symbols of righteous rule. SB 1.4.10: Parikshit is 'pāṇḍūnāṁ mānava-vardhanaḥ' — the increaser of their line.
Śrīmad Bhāgavata Mahāpurāṇa 1.4.10 — Sanskrit Wikisource (pinned oldid=110175)
Sixfold intimacy with Krishna: sight, touch, conversation, lying, sitting, eating
'darshana-sparsha-samlapa-shayanasana-bhojanaih' (SB 1.10.12) — hence separation was unbearable.